[MIPS] Initial checkin for MIPS changes for GOLD.

gold/layout.cc

Index: gold/layout.cc
===================================================================
--- a/gold/layout.cc
+++ b/gold/layout.cc
@@ -2543,6 +2543,8 @@
 
   file_header->set_section_info(this->section_headers_, shstrtab_section);
 
+  target->fix_sections(this, symtab);

[robertm, 2012/04/27 19:46:15]

add a comment explaining what this does

[Aleksandar Simeonov, 2012/05/08 15:21:42]

Sets data with values that are only known after sections are finalized. In this
concrete case it is needed to set flag if there are more then 0x10000 symbols in
dynamic symbol table.

Will add that as a comment in the source.

[robertm, 2012/05/11 21:50:50]

The description you give here is much better than the comment you put in. Is
this something mips specific or a general fix to scons?

+
   // Now we know exactly where everything goes in the output file
   // (except for non-allocated sections which require postprocessing).
   Output_data::layout_complete();
@@ -2973,12 +2975,32 @@
   if (type2 == elfcpp::PT_INTERP)
     return false;
 
+  // This single PT_MIPS_REGINFO segment is required to precede any loadable
+  // segment. We simply make it always third.
+  // TODO AS: Make this only valid for MIPS !!!
+  if (type1 == elfcpp::PT_MIPS_REGINFO)
+    {
+      gold_assert(type2 != elfcpp::PT_MIPS_REGINFO);
+      return true;
+    }
+  if (type2 == elfcpp::PT_MIPS_REGINFO)
+    return false;
+
   // We then put PT_LOAD segments before any other segments.
   if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD)
     return true;
   if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD)
     return false;
 
+  // MIPS needs PT_NULL segment to be last.
+  if (type1 == elfcpp::PT_NULL)
+    {
+      gold_assert(type2 != elfcpp::PT_NULL);
+      return false;
+    }
+  if (type2 == elfcpp::PT_NULL)
+    return true;
+
   // We put the PT_TLS segment last except for the PT_GNU_RELRO
   // segment, because that is where the dynamic linker expects to find
   // it (this is just for efficiency; other positions would also work
@@ -4509,7 +4531,8 @@
 	       && parameters->options().shared())
 	gold_warning(_("shared library text segment is not shareable"));
     }
-  if (parameters->options().shared() && this->has_static_tls())
+  if ((parameters->options().shared() || parameters->options().pie())
+    && this->has_static_tls())
     flags |= elfcpp::DF_STATIC_TLS;
   if (parameters->options().origin())
     flags |= elfcpp::DF_ORIGIN;